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import java.util.*;
public class MyDC {
private final char ADD = '+';
private final char SUBTRACT = '-';
private final char MUTIPLY = '*';
private final char DIVIDE = '/';
private Stack<Integer> stack;
public MyDC() {
stack = new Stack<Integer>();
}
public int evaluate(String expr) {
int op1, op2, result = 0;
String token;
StringTokenizer tokenizer = new StringTokenizer(expr);
while (tokenizer.hasMoreTokens()) {
token = tokenizer.nextToken();
if (isOperator(token)) {
op2 = (stack.pop().intValue());
op1 = (stack.pop().intValue());
result = evalSingleOp(token.charAt(0), op1, op2);
stack.push(result);
} else {
stack.push((Integer.parseInt(token)));
}
}
return result;
}
private boolean isOperator(String token) {
return (token.equals("+") || token.equals("-") || token.equals("*") || token.equals("/"));
}
private int evalSingleOp(char operation, int op1, int op2) {
int result = 0;
switch (operation) {
case ADD:
result = op1 + op2;
break;
case SUBTRACT:
result = op1 - op2;
break;
case MUTIPLY:
result = op1 * op2;
break;
case DIVIDE:
result = op1 / op2;
}
return result;
}
}
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